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    <a href="../index.html">cppreference.com</a> &gt; <a href=
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    isxdigit
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    Syntax:
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  <pre class="syntax-box">
  #include &lt;ctype.h&gt;
  int isxdigit( int ch );
</pre>

  <p>The function isxdigit() returns non-zero if its argument is a
  hexidecimal digit (i.e. A-F, a-f, or 0-9). Otherwise, zero is
  returned.</p>

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